Jure Margeta

University of Split, Spalato, Splitsko-Dalmatinska, Croatia

Are you Jure Margeta?

Claim your profile

Publications (13)25.91 Total impact

  • Jure Margeta, Zvonimir Glasnovic
    [Show abstract] [Hide abstract]
    ABSTRACT: Since the main problem of continuous energy supply from photovoltaic (PV) power plant is intermittence and inability to provide continuous energy supply, this paper proposes its hybridization with hydro energy, or with pump storage hydroelectric (PSH) as a possible solution. This creates a new type of sustainable hybrid power plant which can work continuously, using solar energy as primary energy source and water for energy storage. The characteristics of the solution as an open thermodynamic system are presented, as well as the basic theoretical settings for its application, i.e. key relationships between power and collector field area of PV power plant and working volume of upper storage. The paper introduces hydrological and hydro-energetic indicators for the hybrid plant description, “artificial rainfall”, as the relationship between the water pumped into the upper water storage of the PSH (artificial water inflow) and collector field area of the PV power plant, as well as hydroenergy potential. The proposed hybrid electric power plant does not emit greenhouse gases, produce waste or significantly exploit water resources while the risks to humans and the environment are far smaller than when using conventional technology. This solution is flexible for implementation and can be applied in various climates, hydrological and physical conditions. It is especially productive in cases of joint use of solar and hydro energy where they naturally complement each other as natural energy sources in the annual working cycle.
    Solar Energy. 03/2012; 86(3):972–982.
  • J. Margeta, Z. Glasnovic
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper analyzes a possibility of upgrading hydroelectric plant (HEP) with solar photovoltaic (PV) generator. The main objective of this solution is maximization of green energy production in accordance with local and existing HEP framework. The example of HEP Zavrelje/Dubrovnik in Croatia was used as a paradigm of such exploitation of RES. The results of the analysis confirm that the proposed solution of hybrid work PV-HEP system is natural, realistic, and very promising. By hybridization of these two main natural energy sources, the characteristics of both energy sources are enhanced. The application of such hybrid systems would increase the share of green energy in the electric power systems and thus reduce the CO<sub>2</sub> emission from energy sources.
    IEEE Transactions on Energy Conversion 10/2011; · 2.43 Impact Factor
  • Jure Margeta, Zvonimir Glasnovic
    [Show abstract] [Hide abstract]
    ABSTRACT: The paper presents a new type of Renewable Energy Sources (RES) suitable for exploitation watercourse with periodical-temporary water flow. This innovative solution consist of Hydroelectric Plant (HEP) and solar Photovoltaic (PV) generator working together as one hybrid power plant, producing green energy with the same characteristics as classical hydroelectric plants. The main objective of this hybrid solution is achievement of optimal renewable energy production in order to increase the share of RES in an Electricity Power System (EPS). As a paradigm of such exploitation of RES, the example of HEP Zavrelje/Dubrovnik in Croatia was used, where it was ascertained that the proposed solution of hybrid PV-HEP system is natural, realistic and very acceptable, which enhances the characteristics of both energy sources. The application of such hybrid systems would increase the share of high quality RES in energy systems.Research highlights► A hybrid power plant based on solar energy and temporary water flow is introduced. ► This is innovative system consists of HE power plant and PV generator. ► The achievement is reliable green energy production for certain consumer or EPS. ► As a case study, existing HE Zavrelje–Croatia was used. ► The application of such systems would increase the share of renewable energy.
    Renewable Energy. 01/2011; 36(8):2268-2277.
  • Jure Margeta, Zvonimir Glasnovic
    [Show abstract] [Hide abstract]
    ABSTRACT: An inherent characteristic of renewable energy sources (RES)-based electricity generation systems is intermittency and non-controllability. Therefore, the prerequisite for a more significant use of RES within the energy system is the corresponding capacity of Electric Energy Storage (EES). The existing storage of Hydro Electric Power (HEP) is suggested as a possible solution to this issue. The paper contains a detailed analysis of the possible joint operation of Photovoltaic (PV) generator and HEP. The key element of this scenario is the HEP storage that would serve as EES. The analysis of the possible joint operation of the PV generator and HEP shows it as a natural, feasible and very acceptable solution that would enhance the features of both energy sources. Joint operation would increase the energy production sustainability, cut volatility and increase reliability, and therefore the value of the RES energy, as well as the efficiency of the HEP. The application of the hybrid system will significantly contribute to the share of RES in the energy system and thus to achieving the climate protection objectives. KeywordsHydro energy–Hydro electric power–Renewable energy sources–Hybrid energy systems–Energy storage–Sustainable energy supply
    Water Resources Management 01/2011; 25(9):2219-2239. · 2.26 Impact Factor
  • Zvonimir Glasnovic, Jure Margeta
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper analyses the reality of total renewable electricity scenario (TRES) from renewable energy sources (RES) as a totally green strategy of electric energy production. The paper is based on the EREC's Agency forecast until the year 2040, which foresees the share of 82% of RES, extended to 100% of RES. The key element that creates conditions for achieving this ambitious scenario is an innovative combination of RES and pump storage hydroelectric (PSH) power plants, the so-called Concept-H, which can simultaneously use the energy of local RES (sun and wind) and local precipitation (natural waterflows) and in this way can provide continuous supply of electric power and energy to consumers. The methodology is based on the model of equivalent RES and equivalent reservoir that allows a comprehensive view of available RES and hydro system. The total required land use of RES system would be 29,517Â km2 of RES (which would amount to about 0.5% of the total technical potential of using RES), total reservoir volumes would be 880Â km3 (which is only 8% of all artificial reservoirs built in the world to the date) and the orientation estimate of investment in TRES would then be approximately 1% of world GDP in 2009, which clearly shows that the TRES is realistically feasible. It has been shown that implementation of the green strategy of energy balance fulfilling can be realized with present day technology. Precisely this fact shows that further increase of efficiency of RES and their combining into RES-PSH power plants, along with increase in the cost of classic power fuels and the growing needs for environment protection, the proposed solution of TRES realization could be widely important and thus become a serious alternative to the existing energy strategies and a guideline to decision makers throughout the world.
    Renewable and Sustainable Energy Reviews 01/2011; 15(4):1873-1884. · 5.63 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents the model for optimal sizing of a Solar Thermal (ST) power plant with parabolic collectors, which operates with Pump Storage Hydroelectric (PSH), all for the purpose of providing full energy independence of an isolated consumer. The sustainability of such system is based exclusively on solar energy input (without hybridization with any fossil fuel), as a renewable and pure energy resource, and the use of hydro energy, due to the possibility of its continuous production of energy. The feasibility and characteristics of the ST-PSH power plant were tested on power supply of the Island of Vis in Croatia, and the results show that the proposed model describes the operation of the power plant very well. For average solar irradiation of about 1500kWh/m2/a, precipitation 644mm/a, evaporation 1444mm/a, volume of PSH upper reservoir of 20hm3, electric energy consumption of 18GVAh/a and reserve in the system for 3–4 months, the obtained power of the ST power plant is 22MW, which can produce unit value of the annual thermal energy of 459kWh/m2/a and electric energy of 160kWh/m2/a, while the total collector aperture in the observed case is about 16ha. These results show that ST-PSH plants can be successfully applied on locations with relatively low irradiation, wherein the key element that ensures continuous production of energy is precisely the PSH technology that can in the best way, in economic-technical, and especially in ecological sense, balance the relatively large summer surpluses and winter energy shortages.
    Solar Energy - SOLAR ENERG. 01/2011; 85(5):794-807.
  • Jure Margeta, Zvonimir Glasnovic
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper analyses the hybrid solar and hydro (SHE) system as a unique technological concept of the sustainable energy system that can provide continuous electric power and energy supply to its consumers and the possibilities of its implementation in Europe and areas with similar climate. The sustainability of such system is based on solar photovoltaic (PV) and hydroelectric (HE) energy as renewable energy sources (RES). For the purpose of connecting all relevant values into one integral SHE system, a mathematical model was developed for selecting the optimal size of the PV power plant as the key element for estimating the technological feasibility of the overall solution. Sensitivity analysis (parameter analysis) was made for the model, where local climate parameters were varied: solar radiation, air temperature, reservoir volume, total head, precipitation, evaporation and natural water inflow. It has been established that, apart from total head (which is to be expected), solar radiation, hydro accumulation size and natural water inflow have the biggest effect on the calculated power of the PV power plant. The obtained results clearly show a wide range of implementation of the new energy source (SHE system), i.e. from relatively cold climates to those abundant in solar energy, but also with relatively small quantity of water, because it only recirculates within the system. All this points to the necessity for further development of hybrid systems (RESÂ +Â HE systems) and to the fact that they could play an important role in achieving climate objectives.
    Renewable and Sustainable Energy Reviews 01/2010; 14(6):1580-1590. · 5.63 Impact Factor
  • Zvonimir Glasnovic, Jure Margeta
    Journal of Energy Engineering-asce - J ENERG ENG-ASCE. 01/2010;
  • Zvonimir Glasnovic, Jure Margeta
    Progress in Photovoltaics Research and Applications 06/2009; 17(8):542 - 553. · 7.71 Impact Factor
  • Zvonimir Glasnovic, Jure Margeta
    [Show abstract] [Hide abstract]
    ABSTRACT: This work presents the main features of the new power plant that comprises the modified reversible hydroelectric (HE) power plant operating together with the photovoltaic (PV) power plant. Such Solar Hydroelectric Power Plant (SHE) uses solar energy as the only input for production of solar and hydro energy. Thereat, water reservoir serves for daily and seasonal energy storage, thus basically solving the problem of energy storage, which is the biggest problem of wider use of solar energy. The most expensive part of SHE is the PV generator, whose optimal sizing is essential for providing energetic independence of a settlement or isolated consumer. A systematic approach that includes all relevant elements of this system has been implemented for optimal sizing of the PV power plant. The developed model was used in analysis of certain parameters of the SHE system. The results of the analysis show the system characteristics and that the proposed model describes the operation of the power plant very well. The feasibility and characteristics of the power plant were tested on electric energy supply of the island of Vis in Croatia. It has been established that the system is real, feasible and can be very successfully applied on different locations, for different consumers and can vary in size. The prerequisite for realization of such system is the construction of a modified reversible HE power plant. The presented SHE represents a permanently sustainable energy source that can continuously provide power supply to a consumer, using exclusively natural and renewable energy sources, without causing harmful effects on the environment.
    Renewable Energy. 01/2009; 34(7):1742-1751.
  • Zvonimir Glasnovic, Jure Margeta
    Journal of Irrigation and Drainage Engineering-asce - J IRRIG DRAIN ENG-ASCE. 01/2009; 135(1).
  • Zvonimir Glasnovic, Jure Margeta
    [Show abstract] [Hide abstract]
    ABSTRACT: The usual methods for optimal sizing of photovoltaic (PV) irrigation water pumping systems, which separately considered the demand for hydraulic energy and possibilities of its production from available solar energy with the PV pumping system, are not optimal. However, by systematic approach to the problem, taking into account all relevant elements, from the PV water pumping system, water intake, local climate, soil, crops to method of irrigation, it is possible to optimize the determination of nominal power of the PV generator and obtain quality solutions. This paper presents one such method for optimal sizing. For the purpose of testing the proposed model for optimal sizing, in order to show to what extent it describes the system and to obtain corresponding research results, two areas were selected, in typical climate regions of Osijek and Split, as patterns of continental and coastal Croatia. By variation of certain values in the system, their effects on calculation of the optimal electric power of PV generator were observed.
    Water Resources Management 07/2007; 21(8):1277-1297. · 2.26 Impact Factor
  • Source
    Zvonimir Glasnovic, Jure Margeta
    [Show abstract] [Hide abstract]
    ABSTRACT: The previous methods for optimal sizing of photovoltaic (PV) irrigation water pumping systems separately considered the demand for hydraulic energy and possibilities of its production from available solar energy with the PV pumping system. Unlike such methods, this work approaches the subject problem systematically, meaning that all relevant system elements and their characteristics have been analyzed: PV water pumping system, local climate, boreholes, soil, crops and method of irrigation; therefore, the objective function has been defined in an entirely new manner. The result of such approach is the new mathematical hybrid simulation optimization model for optimal sizing of PV irrigation water pumping systems, that uses dynamic programming for optimizing, while the constraints were defined by the simulation model. The model was tested on two areas in Croatia, and it has been established that this model successfully takes into consideration all characteristic values and their relations in the integrated system. The optimal nominal electric power of PV generator, obtained in the manner presented, are relatively smaller than when the usual method of sizing is used. The presented method for solving the problem has paved the way towards the general model for optimal sizing of all stand-alone PV systems that have some type of energy storage, as well as optimal sizing of PV power plant that functions together with the storage hydroelectric power plant.
    Solar Energy. 01/2007;

Publication Stats

49 Citations
25.91 Total Impact Points

Institutions

  • 2007–2012
    • University of Split
      Spalato, Splitsko-Dalmatinska, Croatia
    • University of Zagreb
      • Faculty of Chemical Engineering and Technology (FKIT)
      Zagreb, Grad Zagreb, Croatia